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<a name="MSP430_002dExt"></a>
<div class="header">
<p>
Previous: <a href="MSP430_002dRegs.html#MSP430_002dRegs" accesskey="p" rel="prev">MSP430-Regs</a>, Up: <a href="MSP430-Syntax.html#MSP430-Syntax" accesskey="u" rel="up">MSP430 Syntax</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Assembler-Extensions"></a>
<h4 class="subsubsection">9.29.2.4 Assembler Extensions</h4>
<a name="index-MSP430-Assembler-Extensions"></a>

<dl compact="compact">
<dt><code>@rN</code></dt>
<dd><p>As destination operand being treated as &lsquo;<samp>0(rn)</samp>&rsquo;
</p>
</dd>
<dt><code>0(rN)</code></dt>
<dd><p>As source operand being treated as &lsquo;<samp>@rn</samp>&rsquo;
</p>
</dd>
<dt><code>jCOND +N</code></dt>
<dd><p>Skips next N bytes followed by jump instruction and equivalent to
&lsquo;<samp>jCOND $+N+2</samp>&rsquo;
</p>
</dd>
</dl>

<p>Also, there are some instructions, which cannot be found in other assemblers.
These are branch instructions, which has different opcodes upon jump distance.
They all got PC relative addressing mode.
</p>
<dl compact="compact">
<dt><code>beq label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jeq label</samp>&rsquo; in case if jump distance
within allowed range for cpu&rsquo;s jump instruction. If not, this unrolls into
a sequence of
</p><div class="smallexample">
<pre class="smallexample">  jne $+6
  br  label
</pre></div>

</dd>
<dt><code>bne label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jne label</samp>&rsquo; or &lsquo;<samp>jeq +4; br label</samp>&rsquo;
</p>
</dd>
<dt><code>blt label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jl label</samp>&rsquo; or &lsquo;<samp>jge +4; br label</samp>&rsquo;
</p>
</dd>
<dt><code>bltn label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jn label</samp>&rsquo; or &lsquo;<samp>jn +2; jmp +4; br label</samp>&rsquo;
</p>
</dd>
<dt><code>bltu label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jlo label</samp>&rsquo; or &lsquo;<samp>jhs +2; br label</samp>&rsquo;
</p>
</dd>
<dt><code>bge label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jge label</samp>&rsquo; or &lsquo;<samp>jl +4; br label</samp>&rsquo;
</p>
</dd>
<dt><code>bgeu label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jhs label</samp>&rsquo; or &lsquo;<samp>jlo +4; br label</samp>&rsquo;
</p>
</dd>
<dt><code>bgt label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jeq +2; jge label</samp>&rsquo; or &lsquo;<samp>jeq +6; jl  +4; br label</samp>&rsquo;
</p>
</dd>
<dt><code>bgtu label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jeq +2; jhs label</samp>&rsquo; or &lsquo;<samp>jeq +6; jlo +4; br label</samp>&rsquo;
</p>
</dd>
<dt><code>bleu label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jeq label; jlo label</samp>&rsquo; or &lsquo;<samp>jeq +2; jhs +4; br label</samp>&rsquo;
</p>
</dd>
<dt><code>ble label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jeq label; jl  label</samp>&rsquo; or &lsquo;<samp>jeq +2; jge +4; br label</samp>&rsquo;
</p>
</dd>
<dt><code>jump label</code></dt>
<dd><p>A polymorph instruction which is &lsquo;<samp>jmp label</samp>&rsquo; or &lsquo;<samp>br label</samp>&rsquo;
</p></dd>
</dl>


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